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Finding the Fourth Proportional to 314.82, 434.38 and 198.31

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Solution

The fourth proportional to 314.82, 434.38 and 198.31 is: 273.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.82 : 434.38 = 198.31 : x
  2. Step 2: Convert to fraction form
    314.82/434.38 = 198.31/x
  3. Step 3: Cross multiply
    314.82x = 434.38 × 198.31
  4. Step 4: Simplify right side
    314.82x = 86,141.90
  5. Step 5: Solve for x
    x = 86,141.90/314.82
  6. Step 6: Final answer
    x = 273.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.